Origin of Species Variorum

→ I 1859 1860 1861 1866 1872

or the survival of the fittest, I 1869

→ OMIT 1869 1872

for the sake of brevity, 1859 1860 1861 1866

→ Selection. 1859 1861 1866 1869 1872

Selection; and it leads to the improvement of each creature in relation to its organic and inorganic conditions of life. 1860

→ or rivalry with 1872

with 1859 1860 1861 1866

→ males; and these characters will be transmitted to one sex or to both sexes, according to the form of inheritance which prevails. 1872

males. 1859 1860 1861 1866

↑ 3 blocks not present in 1859 1860 1861 1866 1872; present in 1869

Natural selection, on the principle of qualities being inherited at corresponding ages, can modify the egg, seed, or young, as easily as the adult. Amongst many animals, sexual selection will give its aid to ordinary selection, by assuring to the most vigorous and best adapted males the greatest number of offspring. Sexual selection will also give characters useful only to the males, in their struggles with other males; and these characters will be transmitted to one sex or to both sexes, according to the form of inheritance which prevails.

→ OMIT 1869 1872

nature, in modifying and 1859 1860 1861 1866

→ OMIT 1861 1866 1869 1872

more living beings can be supported on the same area 1859 1860

→ by so much the more can a large number be supported on the same area,— of 1872

of 1859 1860

by so much a greater number can be supported on the same area,— of 1861 1866

by so much can a greater number be supported on the same area,— of 1869

→ and to the productions naturalised in foreign lands. 1872

or at naturalised productions. 1859

or to naturalised productions. 1860 1861 1866 1869

→ within each class, which 1861 1866 1869 1872

which 1859 1860

→ and the generally well-defined distinctions between the innumerable 1872

of all 1859 1860

and the generally well-defined distinctions of the innumerable 1861 1866 1869

→ in each class throughout the world, may 1861 1866 1869 1872

may 1859 1860

→I have

called,

called

→OMIT Natural →Selection. It leads to the improvement of each creature in relation to its organic and inorganic conditions of life; and consequently, in most cases, to what must be regarded as an advance in organisation.

Nevertheless

Nevertheless,

low and simple forms

would

will

long endure if well fitted for their simple conditions of

life.

Natural selection, on the principle of qualities being inherited at corresponding ages, can modify the egg, seed, or young, as easily as the adult. Amongst many animals, sexual selection will

give

have given

its aid to ordinary selection, by assuring to the most vigorous and best adapted males the greatest number of offspring. Sexual selection will also give characters useful to the males alone, in their struggles →or rivalry with other →males; and these characters will be transmitted to one sex or to both sexes, according to the form of inheritance which prevails. ↑

Whether natural selection has really thus acted in →OMIT adapting the various forms of life to their several conditions and stations, must be judged

....

by the general

tenour

tenor

and balance of

the evidence

evidence

given in the following chapters. But we

already

have already

see

seen

how it entails extinction; and how largely extinction has acted in the

worlds

world's

history, geology plainly declares. Natural selection, also, leads to divergence of character; for →OMIT the more

they

organic beings

diverge in structure, habits, and constitution, →by so much the more can a large number be supported on the same area,— of which we see proof by looking

the inhabitants of any small

spot

spot,

→and to the productions naturalised in foreign lands.

Therefore

Therefore,

during the modification of the descendants of any one species, and during the incessant struggle of all species to increase in numbers, the more diversified

these

the

descendants become, the better will be their chance of

succeeding

success

in the battle

for

life. Thus the small differences distinguishing varieties of the same species,

will

....

steadily tend to

increase

increase,

till they

come to

....

equal the greater differences between species of the same genus, or even of distinct genera.

We have seen that it is the common, the

widely-diffused,

widely diffused,

and

widely-ranging

widely ranging

species, belonging to the larger

genera,

genera

→within each class, which vary most; and these

will

....

tend to transmit to their modified offspring that superiority which now makes them dominant in their own countries. Natural selection, as has just been remarked, leads to divergence of character and to much extinction of the less improved and intermediate forms of life. On these principles,

I believe,

....

the nature of the

affinities

affinities,

→and the generally well-defined distinctions between the innumerable organic beings →in each class throughout the world, may be explained.